Cook Sushi Rice: Rinse rice under cold water until clear. Boil with equal water, cover, and cook on low for 10 mins. Let it sit for 10 mins.
Season Rice: Transfer to a bowl, mix gently with vinegar, and cool to room temp.
Make Teriyaki Chicken: Fry chicken in oil, then add soy sauce, sugar, mirin, and ginger. Simmer until thick and sticky. Let cool.
Prep Veggies: Slice avocado, cucumber, and capsicum.
Assemble Roll: Lay nori on a mat. Spread a thin layer of rice. Add chicken and veggies in the center.
Roll & Seal: Roll tightly with a sushi mat. Wet the edge to seal.
Chill & Slice: Chill the roll for 10 minutes, then cut into 6–8 pieces using a wet sharp knife.
Serve: Plate with soy sauce, wasabi, and pickled ginger. Enjoy!